pitman



Jan. 14, 1930.

H. L. PITMAN COMBINED TYPEWRITING AND COMPUTING MACHINE Original Filed Feb. 11, 1926 3 Sneaks-Sheet 1 s N i Jan. 14, 1930 H, L, PIT AN 11,743,866

COMBINED TYPEWRITING AND COMPUTING MACHINE Original Filed Feb. 11, 1926 5 Sheets-Sheet 2 I A270 ey.

Jan. 14, 1930. H. L. PlTMAN 1,743,365

COMBINED TYPEWRITING AND COMPUTING MACHINE Original Filed Feb; 11, 1926 3 Sheets-Sheet 3 Affa ey.

Patented Jan. 14, 1930 UNITED STATES PATENT OFFICE HENRY I. PITMAN, OF WESTFIELD, NEW JERSEY, ASSIGNOR, BY MESNE ASSIGNMENTS TO ELLIOTT-FISHER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELA- WARE COMBINED TYPEWRITING AND COMPUTING MACHINE Original application filed February 11, 1926, Serial No. 87,533. Divided and this application filed June 22, 1927. Serial No. 200,518.

This invention relates to tabulating mechanism in combined typewriting and computing machines of the Underwood-Hanson type, where power-driven means operate to linespace the platen and return the platen-carriage to a new line-startin position, and from which position tabulating eys and associated means quickly reposition the carriage denominationally within predetermined column fields.

In a combined typewriting and computing machine the operation of typewriter-keys to write a number in a computing zone may simultaneously cause said number to be setup computatively by means which include a tappet carried on the typewriter-carriage, and which actuate denominational jacks to successively select the denominational pin-bars'in which the number is set to be subsequently transferred to computing wheels. As the carriage enters a computing zone the tappet is lifted into position to engage the denominational jacks by means of a supporting member over and along which the-tappet rides.

To avoid actuation of the denominational jacks during tabulating movements of the carriage the supporting member is withdrawn when a tabulating key is operated and causes the tappet to. fall slightly and clear the denominational jacks.

One object of this invention is to provide means whereby an operative may stop the power-driven return movement of the carriage by operating a tabulating key and cause the immediate positioning of the carriage for writing and computing in an intermediate place on the work-sheet without fully returning the carriage to the initial line-starting position. This is of great advantage in cases where entries are written and computed in diflerent columns on the work-sheet. Thus, as soon as the power-driven means has returned the carriage, so that the column on the work-sheet in which it is desired to make an entry is past the printing point, a tabulating key may be depressed and the return movement of the carriage is thereby stopped for lack of driving power and a tabulating movement of the carriage toward the left immediately occurs under the power of its own driY ing spring and which is arrested when a column-stop on the carriage strikes the decimalstop raised in i s path by the tabulating key.

By means of suitable connections the movement of the usual universal bar coacting with the decimal tabulating stops to disengage the carriage-feed rack from its pinion is also used to simultaneously disengage the carriage-returndriving mechanism. This is preferably accomplished by extending the shaft on which the tabulating universal bar is mounted and fastenin an arm thereon to reach and engage the usua linkage by means of which the carriage-return mechanism is engaged, but which, according to the present invention,

may be also used to disengage the carriage-return mechanism.

Another object of the present invention is to provide simple means whereby any tabulating key in operating its universal bar will cause the tappet-supporting member to be withdrawn against the action of a spring or other device, which tends to keep the tappetsupporting member in its efl'ective position, and in the present invention the withdrawal is accomplished Without putting the burden of said spring action upon the tabulating key. The tabulating key may thus be operated with a normal light touch. To this end, when a tabulating key is operated, a power-driven pin is projected into the plane of an arm fastened to a rock-shaft supporting the tappetsupporting member. The pin is simultaneously caused to revolve about a suitable axis, so that'it describes a path intercepting said arm and is thus operative to displace said arm, thereby effecting the withdrawal of the tappet-supporting member. The power-driven pm may be projected by the tabulating keyactuated universal bar, and a flexible springpressed connection that will yield should the pin encounter the face of the arm, escape therefrom, and spring forward due to the spring tension 0 said flexible connection. Latching means are provided to hold the tappet-supporting member in inefl'ective position until the tabulating key is released.

Another object of this invention is to provide means whereby starting and stopping of the motor may be controlled, by means of the same circuit-closing device or switch reguiarly provided for the carriage-return mechanism. This device is actuated upon releasing a train of spring-pressed linkage, by means of which the carriage-return mechanism is engaged. A bar pivoted to this linkage extends toward and interlocks with the circuit-closing device, so as to normally keep it open. When the linkage is released to engagethe carriage-return mechanism this bar is withdrawn, and the circuit-closing device which includes a spring-pressed arm is closed.

,In the present invention, the switch bar or other suitable actuator, by means of which the circuit-closing device is opened or closed, is connected to the carriage-return linkage in such a way that it may be operated independently of said linkage, making it possible to disengage the carriage-return mechanism without stopping the motor when a tabulating key is operated, or to o erate the circuitclosing device independent y of the carriagereturn mechanism linkage, or to operate the circuit-closing device in the usual way when the carriage-return mechanism is engaged or disengaged. To this end, the switch bar or actuator for the circuit-closin device or switch is preferably connected to t e carriagereturn mechanism linkage b means of a pin and inclined slot device an is slidably supported by the previously-mentioned arm,

which disengages the carriage-return mechanism when a tabulating key is operated.

The carriage-return mechanism is engaged by pressing the usual carriage-return key, or the engagement is efiected automaticall by the usual means associated with the leftand marginal carriage-stop.

This application is a division of my application Serial No. 87,533, filed February 11, 1926.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

F igure 1 is a sectional elevation of an Un-- derwood-Hanson combined typewriting and computing machine, and shows only such part of the typewriter-mechanism and computing mechanism as is necessary to illustrate the invention.

Figure 2 is a detail view of the principal letter-feeding elements.

Figure 3 is a view of the switch for starting and stop-ping the motor which 0 rates the carriage-return mechanism and 0t er devices of this invention.

Figure 4 is a skeleton perspective view of the tabulating mechanism and the means by which the tappet-supporting member is withdrawn.

Figure 5 is a rear view of parts shown in Figure 4.

Figure 6 is a detail perspective view of the pin-and-slot connection for the switch-actuating element.

Figure 7 is a detail view showing the relation of the parts when a tabulating key is operated and the tappet-supporting member is about to be withdrawn.

Figure 8 is a detail view showing the tappet-supporting member withdrawn, and also showing the means by which it is latched in its withdrawn position.

Figure 9 is a detail view showing the operation of'theflexible connection as it yields, if the operating pin is projected against the arm that withdraws the tappet-supporting member.

Figure 10 is a detail view showing the relation of the parts when the carriage-return mechanism alone is engaged.

Figure 11 is a diagram showing the'electrical connections.

The Underwood typewriter forming a part of the machine to which this invention is applied, is provided with a decimal tabulating mechanism, which includes keys 11 upon levers 12 fulcrumed at 13. The rear ends 14 of said levers, when operated, raise decimalstops 15, so that the upper ends 15 thereof are in the path of column-sto s 16 on the.

typewriter-carriage 17. The ecimal-stops and tabulating keys are retracted against a stop 17 a by springs 18 applied to said decimalstops. Each decimal-stop 15 has a notch 19 to engage a universal bar 20 mounted upon a shaft 21. Said universal bar, when operated by any of the decimal-stops when a tabulating key is depressed, disengages a carriage-.

feed rack 22 from its pinion 23 by means which includean arm 24, a link 25 and a lever 26. Said lever is pivoted at 27 and connected to said link at 28 and carries a roll 29, which lifts the letter-feed rack upward and holds it disengaged from its pinion during the tabulating movement of the carriage.

Numeral-keys 30 and alphabet-keys 31 by means of the usual key-levers, not shown, and bell-cranks 32, partly shown, swingtype-bars 33 upwardly and readwardly about a fulcrum 34 to rint against a platen 35 around which a wor -sheet, not shown, may be fed. Heels 36 upon the type-bars actuate a universal bar 37 connected to a dog-rocker 38, which includes a fixed dog 39 and has mounted thereon a stepping dog 40. Said dogs co-operate with an escapement-wheel 41 to which is connected the pinion 23.- The carriage is propelled in a letter-feeding or tabulating direction by a spring-motor 42.'

When the carriage moves in letter spacing and reaches a left-hand marginal carriage stop, not shown, a lug 43 on the carriage actuates a cam-lever, not shown, on said left-hand marginal stop to swing a marginal stop-rack 44 about a fulcrum 45, Pivotally connected to said marginal stop-rack at 46 is a link 47 which extends downwardly and is connected to one end of a lever 48 pivoted upon the typewriter-frame 49 at 50. The other end pulled rearwardly by a spring 53.

arm keyed to a shaft 56. As the carriage in its letter-feedino movement or otherwise reaches the line-en marginal stop, the carriage-return trip-link 52 is released from its holding plate and its movement by the-spring 53 causes the rotation of the shaft 56. The carriage-return trip-link may also be released by means' of a manually o erated lever 55 pivoted on the typewriterrame at 56*. Said lever when operated raises the forward end of the trip-link 52 to release it from the plate 54 through thecamming of a by-pass pawl 57 by the tip 57 of said lever as it is operatedi The lever 55 is returned to its normal position against a stud 58 by a spring 59, and is ineffective to release the link on account of said by-pass pawl. F astened to said shaft is another arm 58 which is connected by means of a link 59 to an arm 60 fastened to a shaft 61, upon which is fastened an arm 62, which engages a slidable clutchmember 63. As the shaft 61 is rotated by means of the aforesaid connections through the movement of the link 52, the clutch-member 63 actuated thereby slides into engagement with a clutch-member 65 keyed to a shaft 66. Said shaft 66 has its bearin in a bracket 67 attached to the typewriterrame 49 in the usual manner. A pulley 68 is keyed to said shaft 66, and by means of a belt 122 is connected to a driving motor 7 0. Said driving motor 7 O is controlled by a switch indicated at 71, Figures 3 and 11, actuated by a connection from the link 52, to an arm 72, fastened to the shaft 56 to operate a switch bar 77. In the end of said arm 72 is a stud 73, which has a shoulder 74, and a head 75, to be assembled through a cam-slot 76 in the end of the switch bar 77, see Figure 6. After the cam-slot 76 has been placed over said head 75, the stud 73 may be given a quarter turn, so as to retain said cam-slot 76, the stud 73 then being secured to the arm 72 by any suitable means, as by a lock-nut 73 The bar 77 is slidably supported upon an arm 78 and between pins 79 projecting from said arm. The purpose of said arm 78 will press ently be described. It will be seen that, as said shaft 56 is rotated, as when the clutchmembers 63'and 65 are engaged, Figure 10, the bar 77 will move longitudinally to close the switch contained within a' casing 77 For flexibility the bar 77 has slidably mounted thereon a member 69 connected to said rod by a spring 69. The rear end of said member engages the switch to close it. After closing said switch the bar 77 has an excess movement during which the spring 69 yields.

When the typewriter is used with a computing mechanism, there are mounted on its carriage tappets 80 supported by rods 81 and 82', the rod 81 serving as a fulcrum for the tappets 80 which are raised by the usual tappet-supporting member 83. Said 'tappet supporting member 83 is coextensive with a series of jacks 84 pivoted at 85 and engageable by a one-way pawl 87 mounted upon each tappet 80, and each tappet is upheld as it rides over the tappet-supporting member 83 by means of a roll 87 fastened to said tappet. In this manner, the carriage, moving step by step through a computing zone, operates at each step one of the jacks 84 and causes a downward thrust of a rod 88, to select in the usual manner one of the computing machine pin-bars which are not shown. The computing mechanism is of the type shown in the patent to O. Minton,-No. 1,280,065, dated September 24, 1918. The tappet-supporting member 83 is supported between arms 89 fastened to a rock-shaft 90, which is pivoted between brackets, not shown, upon the'typewriter-frame 49. The usual springdevice 91, described in the patent to V. L.

Gumprecht, No. 1,268,565, dated June 4, 1918, operates to keep the tappet-supporting member 83 in effective position to raise each tappet 80, so that it may engage the jacks 84.

When tabulating the carriage it is desirable to withdraw the tappet-supporting member 83, so that the pawl 87 on the tappet will not operate the jacks 84 during the comparatively rapid movement of the carriage as it is tabulated. The withdrawal of the tappet-member 83 is effective against the reaction of the spring-device 91, and to avoid putting the burden of overcoming this reaction upon the tabulating key, means are provided to withdraw the tappet-supporting member 83 by power when a tabulating key is operated. To this end, there is mounted upon the rock-shaft 90 an arm 92, which has i a cam-formation 93, see Figure 5. When a tabulating key is operated, there is projected into the plane of this cam-formation 93 a pin 94, said pin being projected through a hole 95 in the web of the pulley 68. This pin may be mounted upon a disk 96 which slides upon a bearing 97 formed upon the bracket 67. To slide the pin 94 forward and backward, a groove 98 is formed in a hub of said disk 96 t'obe engaged by a pair of arms 99 mounted on a shaft 100, and yieldably connected thereto by means of a spring 118. One end of said spring is fastened to the shaft 100 by means of a collar 119, and the other end presses the arms 99 which are held by a stud 120 driven through a slot 120in a hub 121 of the arms 99 into the shaft 100. Should the pin 94 be in a position where its projection would be obstructed by the arm 92, the spring 118 will 101 in the tabulator-stop-franic and in a hole 102 in a lug121 fastened to the bracket 67.

. To rotate said shaft 100 and project the pin 94 into the plane of the cam-formation 93 whenever a tabulating key is operated, said shaft is further provided with an arm 103 fastened thereto and connected by means of a link 104 to the link 25, which is used to disengage the carriage-feed rack. It will be remembered that this link 25, connected to the universal bar 20'by means. of the arm 24, is operated whenever a tabulating key is depressed, and is effective to rotate the shaft 100 to drive the pin 94 into the plane of the cam-formation 93 and the motor 70 is simultaneously started, to drive the belt 122 to cause the pulley. 68 and pin 94 to revolve to rock the shaft 90.

To start the motor the depression of any 94 has passed the cam-formation 93, the

tappet-supporting member 83 tends to return to tappet-raising position again. To prevent this until the tabulating key is released, a latch 105 is provided and is pivoted to one of the arms 89 at 106, and is pressed by a spring 107, so that normally an extension 108 of said latch 105 bears against the shaft 100. When a tabulating key is depressed causing the shaft 100 to rotate, an arm 109 thereon raises said latch by means of a lug 110 projecting from said latch. As the tappet-supporting'member ,83 is withdrawn, the latch is pulled rearwardly and the lug 110 falls behind a holding edge 111 on the arm 109. It will be seen that when the tabulating key is' released the arm 109 will be withdrawn from said lug 110, and

the tappet-supporting member resumes its normal position.

Heretofore in an automatic carriage-return there was no way of stopping the carriage-return movement until the carriage had reached the right-hand marginal carriagestop and rotated a shaft 112 by the usual means, which included a dog 113 keyed to said shaft 112 and actuated b the lug 43. As said shaft 112 is rotated it isengages the clutch-elements 63 and 65 by means which include an arm 114, fastened to said shaft 112, a link 115, a sliding member 116 and an arm 117 fastened to the shaft 61. Details of the means associated with the leftand right hand marginal carriagestops to engage and 'termined by the right-hand marginal carriage-stop, and then to tabulate anew to the place where the entry was to be made. If several columns intervened between the starting point and the placethe entry was to be made, such columns could only be skipped by successive operations of the tabulating keys. To avoid this, means are provided whereby, as soon astl e carriage has returned far enough so that the column in which it is desired to make the next entry is past the printing point, the return movement of the carriage may be stopped by pressing the proper denominational tabulating key. The carriage as soon as its return movement is thus stopped for lack of driving power will be immediately tabulated under the power of its own spring-drum to the proper denomina tional column position according to the key depressed, and said key is held depressed until the carriage is thus, tabulated. To accomplish this the previously-mentioned arm 78 has a camming edge 123 co-operative with the surface 124 of the stud 73, and effective whenever a tabulating key is depressed to cam the arm 72 aside, thereby causing the restoration of the linkage 5862 which has effected the engagement of the carriage-return clutch-members 63 and 65. The circuit to the motor, however, is not broken as long as the tabulating key is depressed,,so that the tappet-support 83 is withdr'a'wn in the manner described, and thebar 77 held in its circuit-closing position until the tabulating key is released.

It will be noted that the depression of the carriage-return key starts-the motor and closes a clutch 63-65, whereby the motor will drive the carriage in a carriage-return direction to a marginal-stop position, which determines the line-starting position for the carriage automatically and independently of the carriage return key and disables the motorratio 0 the carriage-feed rack from its feeda by the depression of the tabulating key; that the depression of any denominational tabulating key vibrates a universal bar having cammin connections that eifect the sepaing a d holding pinion to release the carriage to its driving spring, and restores the key-released trip-link 52 to its normal position, but does not withdraw the switch-bar 69 to break the circuit to the return motor, which continues to rotate to prevent the accidental restoration of the tappet-roller 83 until the carriage has fully advanced to the tabulating position within a column-area; that, when the tabulating advance of the carriage is completed and the tabulating key is released, the restoration of-the parts from the Figure 8 positions to the positions of Figures 7 and 9 is eflected by the return of the universal bar 20 where the lifting of the link rocks the shaft 100 to withdraw the pin 94, vibrates the arm 109 to release the latch 105 to restore the roller 83 to lift the tappet 80, and vibrates a jack 84 corresponding to the decimal value of the key depressed; that the restoration of the universal bar also vibrates the arm 78 to effect the withdrawal of the switch-bar 77 to open the switch 71 and;

stop the motor that an operator can readily and expertly manipulate the tabulating keys to cut into the carriage-returning movement very close to the right-hand margin of a column-area or even between adjoining column-fields, and then immediately arrest the carriage at a denominational position therein, thus avoiding the useless operation of fully restoring the carriage rightward and then advancin the carriage, column by column, as heretofore practiced, except where complicated column-skipping mechanism is employed which does not tabulate denominationally; and that an operator can limit the returning movement of the carriage to a column-width, if desired, and tabulate directly to the denominational position therein, thus providing an important. time and labor saving mode of operation and giving the operator a complete carriage-direction control without removing the hands from the keyboard.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without; others.

Having thus described my invention, I claim 1. In a combined typewriting and computing machine, the combination with typewriting mechanism including a letter-feeding carriage and column-stops, of means including pressible keys for positioning said carriage according to said column-stops, computing mechanism including denominational jacks for transferring numbers written by said typewriting mechanism to said computing mechanism, one or more loose tappets moving in unison with or upon said carriage to actuate said jacks, one or more springpressed tappet-supports to hold said tappets, so that they may operate said jacks, a carriage-return mechanism including a motor, means for engaging said carriage-return mechanism and for starting said motor, means operable by pressing any one of said keys whereby said carriage-return mechanism if previously engaged is disengaged without stopping said motor, said motor continuing to rotate until said key is released, means whereby said motor is started if said carriage-return mechanism is not engaged, and means also operable by said pressing of said key whereby said rotation of the motor causes the withdrawal of said tappet-supports, thereby disconnecting the typewriting and computing mechanisms.

2. Ina combined typewriting and computing machine, the combination with typewriting mechanism including a letter-feeding carriage, means including a tabulating key for positioning said carriage in predetermined zones, and computing mechanism, of means controlled by said carriage for operatively connecting said typewriting mechanism to said computing mechanism while the carriage is in said zones, carriage-return mechanism including an electric motor and a pair of switch contacts normally separated to render said motor silent, means whereby said carriage-return mechanism is engaged and said switch contacts are brought together to start said motor, means operable by said tabulating key to bring said switch contacts together independently of said carriage-return mechanism and rotate said motor, and means whereby the rotation of the motor, when effected by said tabulating key, also renders the a connection between said typewriting and computing mechanisms ineffective.

3. In a combined typewriting and computing machine, the combination with typewriting mechanism including a letter-feeding carriage and computing mechanism, of springpressed means whereby operative connection A between saidtypewriting and computing mechanisms is normally maintained, pressible tabulating keys, carriage-return mechanism including control linkage therefor and an electric driving motor, a motor-control switch, means operable by said motor when one of said keys is pressed to operatively disconnect said typewriting and computing mechanisms, a movable switch-actuating element, a member which is displaced by pressing and releasing one of said keys, at eonnection between said member and said switchactuating element, whereby said element is displaced when said member is displaced, and a pin-and-cam slot connection whereby said switch-actuating element is connected to said carriage-return mechanism control linkage, said connection being effective to close and open said switch when said control linkagefor said carriage-return mechanism is actuated, or when said one of said keys is pressed and released.

4. In a combined typewriting and computing machine, the combination with typewriting mechanism including a letter-feed carriage, and computing mechanism, of means depending on the letter-feed movement of the carriage whereby operative connection between said typewriting and computing mechanisms is normally maintained, tabulating keys, carriage-return mechanism including an electric driving motor, a motor-control switch including a pair of contacts normally separated to render said motor silent, means controlled by said tabulating keys and operable by said motor to render the connection between said typewriting and computing mechanisms inoperative during a tabulating carriage movement, and means whereby sai contacts are brought together and separated by engaging and disengaging said carriagereturn mechanism or by pressing and releasing any one of said tabulating keys.

5. In a combined typewriting and computing machine, the combination with typewriting mechanism including a letter-feed carriage and'computing mechanism, of springpressed means whereby operative connect on between said typewriting and computing mechanisms is normally maintained, pressible tabulating keys, carriage-return mechanism including an electric driving motor a motor-control switch, means controlled by said tabulating keys and operable by said motor to operatively disconnect said typewriting and computing mechanisms, means including a key to engage said carriage-return mechanism, carnage-control means to engage and disengage said carriage-return mechanism, means operable by pressing said tabulating keys to disengage said carriagereturn mechanism, and means whereby said switch is closed and opened either by engaging and disengaging said carriage-return mechanism independently of said tabulatlng keys or by pressing and releasing any one of said tabulating keys when said carriage-return mechanism is disengaged, said lastnamed meansbeing also effective to keep said switch closed as said carriage-return mechanism is disengaged by pressing any one of said tabulating keys.

6. In a combined typewriting and computing machine, the combination with typewriting mechanism including a letter-feeding carriage and computing mechanism, of spring-pressed means whereby operative connection between said typewriting and computingmechanisms is normally maintained, a shaft on which said spring-pressed means 'is mounted, an arm on said shaft, pressible to revolve said element about an axis, so that said element describes a path normally intersected by said arm and displaces said arm from said path, thereby rocking said shaft and causing the operative disconnection of said typewriting and computing mechanisms, and eans whereby said disconnection is maintained while said key is pressed.

7. In a combined typewriting and computing machine, the combination with ty ewriting mechanism including a letter-Feeding carriage, computing mechanism, and a driving motor for certain operations of said mechanisms, of means depending on the letter-feed carria e movement whereby operative connection etween said typewriting and computing mechanisms is normally maintained, a shaft rotatable to shift said means and render said connection ineffective, an arm on said shaft, tabulating keys, a revolvable element connected to said motor and normally clearing said arm, means operable by any one of said keys and including a yieldable device, whereby said arm and said revolvable element are relatively displaced, so that said revolvable element ma enga e said arm for rrotating said shaft, said yiel able device becoming efiective if said element and said arm happen to be in a position where their relative displacement would otherwise be obstructed by each other, said element describing a circular ath normally intersected by said arm for dis lacing said arm from said path, and there y causes the operative disconnection of said typewriting and computinginechanisms, and means whereby said disconnection is maintained whilesaid key is pressed.

8. In a combined ty ewriting and computing machine, the com ination with a letterfeeding typewriter-carriage, and computing mechanism including denominational elements, of a shiftable device spring-pressed into effective position whereby said carriage in its letter-feed movements is enabled to successively engage and displace said denominational elements, key-controlled carriage-tabulating mechanism, a tappet, means for mounting said tappet for clrcular revolution about an axis to engage and displace said shiftable device, said 'mounting means arranged so that said tappet is normally retracted to clear said device, power-driven means for revolving said tappet, and means whereby the engagement of said tabulating mechanism causes the revolution of said tappet and concomitantly projects said tappet into position for engagin and displacing said device so that the carriage in a tabulating movement is relieved of displacing said denominational elements. c

9. In a combined typewriting and computing machine, the combination with a letterfeeding typewriter-carriage, and computing mechanism including denominational elements, of a shiftable device spring-pressed into efi'ective position whereby said carriage in its letter-feed movements is enabled to successivel engage and displace said denominational e ements, key-controlled carriage-tabulating mechanism, a tappet, means for mounting said tappet for circular revolution about an axis to engage and displace said shiftable.

device, said mounting means arranged so that said tappet is normally retracted to clear said device, power-driven means connectible to effeet a return movement of said carriage opposite to the letter-feedin and tabulating movements, said power-( iven means also effective to revolve said tappet, and means whereby enga ement of said tabulating mechanism is e ective to disconnect the carriage from said power-driven means if said carriage is so connected, and concomitantl cause the projection of said tappetinto pos1- tion for engaging and dis lacing said device so that the carriage in a tabulatingmovement is relieved of displacing said denominational elements.

10. In a combined typewriting and computing machine, the combination with a let'- ter-feeding typewriter-carriage, and computing mechanism includin denominational elements, of a shiftable fevice spring-pressed into effective position whereby said carriage in its letter-feed movements is enabled to successively engage and displace said denominational elements, key-controlled carriage-tabulating mechanism, o'wer-driven rotatable means, means for con itioning said rotatable means to engage and return said carriage, means called into action by operation of said tabulating mechanism, to condition said rotatable means to be efiective for displacing said shiftable device so that the carriage in a tabulating movement will be relieved of dis placing said denominational elements, a member shiftable for starting and stopping said rotatable means, and means whereby initiation and termination of the carriage-returning operation or tabulating operation may actuate said member to correspondingly start and stop said rotatable means.

11. In a combined typewriting' and computing machine, the combination with a letter-feeding typewriter-carriage, and computing mechanism includin denominational elements, of a shiftable evice spring-pressed into eiiective position whereby said carriage in its letter-feed movements is enabled 'to successivel engage and displace said denominational e ements, key-controlled: carriagetabulating mechanism, power-driven rotatable means, means for conditioning said rotatable means to engage and return said carriage, means whereby the operation of said tabulating mechanism may arrest the return. movement of said carriage and efiect tabulation of said carriage in a direction contrary to said movement before said carriage is fully returned to a line-starting position, means called into action by operation of said tabulating mechanism to condition said rotatable means to be effective for displacing said shiftable device so that the carriage in a tabplating movementwill be relieved of displacing said denominational elements, a member shlftable for starting and stopping said rotatable means, and means whereby the initiation of the carriage return operation may be effective upon said member to start said rotatable means, and the termination of the tabulating operation may be eifective upon said member to stop said rotatable means. I

12. In a combined typewriting and computing machine having computing-mechanism, a letter-feeding carriage, a motor, carriage-return mechanism operable by said motor, and mechanism for tabulating said carriage in a letter-feeding direction, the combination with means operable by said motor and controlled by said tabulating mechanism for disabling said computing mechanism during a tabulating movement of said carriage, of motor-control means whereby said motor may be started and stopped in con-. comitance with the initiation and termination of either acarriage-return operation or a tabulating operation, and whereby said carriagereturn movement may be stopped by initiating a tabulating operation, and the motor kept running to disable thecomputing mechanism, said motor-control means including a motor-control member shiftable to start and stop saidmotor, an element vibrated by said tabulating mechanism to engage and displace the carriage-return mechanism to stop a carriage-return movement, said motor-control member having a cam-and-pin connection to said carriage-return mechanism, and a sliding support on said vibrated element, said cam-and-pin connection and sliding support constraining said motor-control member to be conditioned to start and stop said motor or keep it running as aforesaid.

HENRY L. PITMAN. 

